Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eef918d13738330…

MALICIOUS

PDF

46.6 KB Created: 2020-08-13 21:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fe4fd9b09e77bf9b41487aae644c8c0 SHA-1: b47564855f130ea8ecaefe0690d7aec60bc55abc SHA-256: 5eef918d137383304f303dca16f1e29e0ea25334881979a5efe98ce8ff347e22
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or SEO spamming operation. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.cc', which is used to obscure the final destination. The document body, though heavily obfuscated, contains text related to 'front end interview questions and answers pdf', likely a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=front+end+interview+questions+and+answers+pdf
    • http://suzod.joconet.com/uploads/1/3/0/8/130874330/2134242.pdf
    • http://sosoradu.adamkk.com/uploads/1/3/1/1/131163658/xomipunibelujoji.pdf
    • http://files.whipperwillridge.com/uploads/1/3/1/4/131437385/3be94ea8ce8be47.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/polonafebomi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8392/files/etude_assainissement.pdf
    • https://cdn.shopify.com/s/files/1/0449/9764/0360/files/public_speaking_rubric_middle_school.pdf
    • https://cdn.shopify.com/s/files/1/0431/9910/3136/files/revemufadoxebuxoberakavat.pdf
    • https://cdn.shopify.com/s/files/1/0448/4349/9677/files/body_language_essentials_joe_navarro.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6290/files/5933888282.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/denukudovujaburamiwawonus.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/7390775150.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6703/files/37297093982.pdf
    • https://cdn.shopify.com/s/files/1/0433/4744/3865/files/fibotolenemufitekesogemin.pdf
    • https://cdn.shopify.com/s/files/1/0439/2484/8795/files/speech_about_teachers_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2040/files/gta_5_online_modding_ps3.pdf
    • https://cdn.shopify.com/s/files/1/0440/4723/7285/files/english_grammar_book_for_class_9_free_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076ef.bin
75ab573a9dfddecd425d6c9262cdc15c8dd0a8eca7dc0e025435cb4f48480c19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76EF 5236 bytes
font_01_sfnt_off000088e2.bin
75c1582af11b6022c7640ccd28c7489172df03e0fb41069f94346389128a6bca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88E2 10828 bytes

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